Moreover, although the adversaries collect many testimonies on this topic to prove that the Mass is a sacrifice, yet this great tumult of words will be quieted when the single reply is advanced that this line of authorities, reasons and testimonies, however long, does not prove that the Mass confers grace er opere operato, or that, when applied on behalf of others, it merits for them the remission of venial and mortal sins, of guilt and punishment. This one reply overthrows all objections of the adversaries, not only in this _Confutation_, but in all writings which they have published concerning the Mass. And this is the issue [the principal question] of the case of which our readers are to be admonished, as Aeschines admonished the judges that just as boxers contend with one another for their position, so they should strive with their adversary concerning the controverted point, and not permit him to wander beyond the case. In the same manner our adversaries ought to be here compelled to speak on the subject presented. And when the controverted point has been thoroughly understood, a decision concerning the arguments on both sides will be very easy. For in our Confession we have shown that we hold that the Lord's Supper does not confer _grace ex opere operato_, and that, when applied on behalf of others, alive or dead, it does not merit for them _ex opere operato_ the remission of sins, of guilt or of punishment. And of this position a clear and firm proof exists in that it is impossible to obtain the remission of our sins on account of our own work _ex opere operato_ [even when there is not a good thought in the heart], but the terrors of sin and death must be overcome by faith when we comfort our hearts with the knowledge of Christ, and believe that for Christ's sake we are forgiven, and that the merits and righteousness of Christ are granted us, Rom. 5, 1: Being justified by faith, we have peace. These things are so sure and so firm that they can stand against all the gates of hell. If we are to say only as much as is necessary, the case has already been stated. For no sane man can approve that pharisaic and heathen opinion concerning the _opus operatum_. And nevertheless this opinion inheres in the people, and has increased infinitely the number of masses. For masses are purchased to appease God's wrath, and by this work they wish to obtain the remission of guilt and of punishment; they wish to procure whatever is necessary in every kind of life [health riches, prosperity, and success in business]. They wish even to liberate the dead. Monks and sophists have taught this pharisaic opinion in the Church.